I assume when you say "in two weeks try to piece everything together" that you are working in two week sprints in an agile process. The issue in my opinion is that the pieces you are working on are too big and needs to be broken down further. If the single thing you are working on takes up the entire two weeks of your sprint then it's too big. In my experience a good rule of thumb is that items you work on should be less than the sprint they exist in. Also a highly functioning team should know how things are being implemented through conversations and proper design specs resulting in less surprises.
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I assume when you say "in two weeks try to piece everything together" that you are working in two week sprints in an agile process. The issue in my opinion is that the pieces you are working on are too big and needs to be broken down further. If the single thing you are working on takes up the entire two weeks of your sprint then it's too big. In my experience a good rule of thumb is that items you work on should be less than the sprint they exist in. Also a highly functioning team should know how things are being implemented through conversations and proper design specs resulting in less surprises.